LCoS, LCD, and 3-DLP devices may need a bit of adjustment to align the 3 individual color panels on top of one another. This is why the tech said that one color was about 1 pixel off. It is very common for 3 chip displays to have the colors just be a tad off of perfect convergience. Never as bad as CRT technology, but nonetheless a real issue with any 3-chip display device.
Single chip DLP does not EVER have this issue, but does sometimes exhibit rainbows... which can cause headaches for some people.